Foaming and dyeing integrated production line for polymer material product, and method thereof

ABSTRACT

The present invention discloses a foaming and dyeing integrated production line for a polymer material product, and a method thereof. The production line comprises a foaming and dyeing kettle, a pressure control module, a dye separation module, a fluid liquefaction and storage module, a fluid pressurization delivery module, a fluid heating module and a dyeing circulation module. The production line integrates the functions of one-step foaming and supercritical fluid dyeing of polymer material, thereby being simple in structure, comprehensive in function, convenient to operate, high in production efficiency, good in product quality and low in cost; besides, the production line can carry out both dyeing and foaming operations, only foaming operation or only dyeing operation on polymer material.

TECHNICAL FIELD

The present invention relates to the technical field of supercriticalfluid foaming and dyeing processing of polymer material, in particularto a foaming and dyeing integrated production line for a polymermaterial product, and a method thereof.

BACKGROUND

Chinese invention patent CN 109385058 discloses a method for preparing afoamed product of a moldless three-dimensional structure by means of asupercritical fluid, comprising a supercritical fluid delivery system, athree-dimensional foaming system and a preheating system; a polymer rawmaterial is pressure-molded into a foamed preplastic; then the foamedpreplastic is preheated in the preheating system; after the temperatureis increased to a preheating temperature, the foamed preplastic isdelivered into the three-dimensional foaming system; a supercriticalfluid is then introduced; after the supercritical fluid completelyswells and diffuses into the polymer, the pressure is released to obtainthe foamed product. The foaming method only includes a foaming procedureand is not applicable when colored materials are required. Moreover, inthe foaming procedure, foaming is carried out in the foaming systemafter the processing in the preheating system, so that it takes multipleoperation steps and multiple system devices for carrying out the steps,thereby leading to prolonged production time and high cost; besides,applications for materials with multiple colors cannot be achieved.

SUMMARY

An object of the present invention is to overcome the defects in theprior art, and provides a foaming and dyeing integrated production linefor a polymer material product, and a method thereof.

To achieve the above object, in a first aspect, provided is a foamingand dyeing integrated production line for a polymer material product,comprising a foaming and dyeing kettle for foaming and/or dyeing, apressure control module for controlling operation pressure of thefoaming and dyeing kettle, a dye separation module for separating CO₂from dye remaining after dyeing, a fluid liquefaction and storage modulefor liquefying and storing CO₂, a fluid pressurization delivery modulefor pressurizing CO₂, a fluid heating module for heating CO₂, and adyeing circulation module for circularly delivering dye in cooperationwith CO₂ to the foaming and dyeing kettle for dyeing; the pressurecontrol module is connected to a first fluid outlet of the foaming anddyeing kettle, the dye separation module is connected between thepressure control module and the fluid liquefaction and storage module,the fluid pressurization delivery module is connected between the fluidliquefaction and storage module and the fluid heating module, the fluidheating module is connected to both a fluid inlet of the foaming anddyeing kettle and the dyeing circulation module, and the dyeingcirculation module is connected to both the fluid inlet of the foamingand dyeing kettle and a second fluid outlet of the foaming and dyeingkettle.

The foaming and dyeing kettle comprises a kettle body, a lid, anagitator driver and an agitator paddle, the kettle body is horizontallyarranged, the lid is installed inside an open end of the kettle body ina sealed manner, the agitator driver is axially installed at a closedend of the kettle body, an agitator shaft of the agitator driverpenetrates through the kettle body and extends into the kettle body, theagitator shaft is connected to the agitator paddle inside the kettlebody, and the lid is locked and unlocked with the kettle body by meansof a wedge-type quick-open locking mechanism.

The pressure control module comprises an automatic pressure regulatorvalve, a first switch valve is arranged between an inlet end of theautomatic pressure regulator valve and the first fluid outlet of thefoaming and dyeing kettle, and an outlet end of the automatic pressureregulator valve is connected to the dye separation module.

The dye separation module comprises an evaporator and a dye recovery andseparation kettle, an inlet end of the evaporator is connected to thepressure control module, an outlet end of the evaporator is connected toan inlet end of the dye recovery and separation kettle, an outlet end ofthe dye recovery and separation kettle is connected to the fluidliquefaction and storage module, and a second switch valve is arrangedat a recovery port of the dye recovery and separation kettle.

The fluid liquefaction and storage module comprises a condenser, a CO₂circulating storage tank, a CO₂ replenishing storage tank and a CO₂delivery pump, an inlet end of the condenser is connected to the dyeseparation module, an outlet end of the condenser is connected to aninlet end of the CO₂ circulating storage tank, an outlet end of the CO₂circulating storage tank is connected to the fluid pressurizationdelivery module; the CO₂ delivery pump is connected between an outletend of the CO₂ replenishing storage tank and a fluid replenishing portof the CO₂ circulating storage tank, and a third switch valve isarranged between the CO₂ delivery pump and the CO₂ replenishing storagetank.

The fluid pressurization delivery module comprises a CO₂ high-pressurepump, an inlet end of the CO₂ high-pressure pump is connected to anoutlet end of the fluid liquefaction and storage module, and an outletend of the CO₂ high-pressure pump is connected to the fluid heatingmodule.

The fluid heating module comprises a heater, a fourth switch valve isarranged at an outlet end of the heater, and an outlet end of the fourthswitch valve is connected to both the fluid inlet of the foaming anddyeing kettle and the dyeing circulation module.

The dyeing circulation module comprises a dyeing circulation pump and adye kettle, a fifth switch valve is arranged between an outlet end ofthe dyeing circulation pump and a fluid inlet of the foaming and dyeingkettle, an outlet end of the dye kettle is connected to an inlet end ofthe dyeing circulation pump, and a sixth switch valve is arrangedbetween an inlet end of the dye kettle and the second fluid outlet ofthe foaming and dyeing kettle.

The production line further comprises a N₂ supply module for providingN₂ during foaming operation, an outlet end of the N₂ supply module isconnected between the fluid pressurization delivery module and the fluidheating module, the N₂ supply module comprises a N₂ storage tank, a N₂high-pressure pump and a vaporizer, a seventh switch valve is arrangedbetween an outlet end of the N₂ storage tank and an inlet end of the N₂high-pressure pump, an inlet end of the vaporizer is connected to anoutlet end of the N₂ high-pressure pump, and an outlet end of thevaporizer is connected between the fluid pressurization delivery moduleand the fluid heating module.

In a second aspect, provided is a foaming and dyeing integratedproduction method for a polymer material product, comprising thefollowing steps of:

(1) material loading: putting a polymer material preform into a foamingand dyeing kettle, and loading dye for dyeing into a dyeing circulationmodule;

(2) supercritical fluid dyeing: gasifying CO₂ from a fluid liquefactionand storage module sequenctially through pressurization in a fluidpressurization delivery module and heating in a fluid heating module andinjecting the CO₂ into the foaming and dyeing kettle, stoppingpressurization when the CO₂ reaches a supercritical state meetingrequirements of a dyeing process, then starting the dyeing circulationmodule to begin a dyeing circulation process in which the CO₂ in thesupercritical state enters the dyeing circulation module and dissolvesthe dye in the dyeing circulation module, the CO₂ carrying the dyereturns to the foaming and dyeing kettle to dye the polymer materialpreform in the foaming and dyeing kettle a desired color, when dyeingrequirements are met, the CO₂ flows out of the foaming and dyeing kettleand is subjected to pressure release in a pressure control module, theCO₂ is separated from the dye remaining after dyeing in a dye separationmodule, and the CO₂ with the dye separated enters the fluid liquefactionand storage module to be liquefied and stored;

(3) one-step foaming: when the dyeing process is finished, injecting CO₂and/or N₂ pressurized in the fluid pressurization delivery module andheated in the fluid heating module into the foaming and dyeing kettleaccording to a proportion of fluid required for foaming, and stoppingpressurization and starting foaming operation when requirements of afoaming process are met; and

(4) unloading: when the foaming process is finished, opening the foamingand dyeing kettle, and taking out a foamed and dyed polymer materialproduct in the foaming and dyeing kettle.

The polymer material preform comprises a sheet, granular orthree-dimensional object made of any one of polyethylene, polylacticacid, polypropylene, polystyrene, polymethyl methacrylate,polycarbonate, acrylonitrile-butadiene-styrene copolymer, polyethyleneterephthalate, polyamide, polyimide, polyphenylene sulfide, polyethersulfone, polyether ether ketone, rubber, silicone rubber, ethylenepropylene diene monomer, ethylene-vinyl acetate copolymer, thermoplasticpolyurethane, thermoplastic elastomer, or a combination thereof.

The dye comprises any one of a disperse dye, an azoic dye, a cationicdye, a reactive dye, an acid dye, a condensation dye, or a combinationof.

Depending on material of the polymer material product, temperatures fordyeing and foaming are individually controlled between 60° C. and 200°C., pressures for dyeing and foaming are individually controlled between10 MPa and 35 MPa, and times for dyeing and foaming are individuallycontrolled between 40 minutes and 180 minutes.

Compared with the prior art, the present invention has the beneficialeffects that:

1. The production line of the invention integrates the functions ofone-step foaming and supercritical fluid dyeing of polymer material, sothat preheating, foaming and dyeing operations can be completed atdifferent process stages in one device, i.e. the foaming and dyeingkettle, and a microcellular foamed product with accurate size, fine foamand controllable hardness can be obtained, while dyeing of the foamedproduct can be carried out at the same time; and the production line issimple in structure, reasonable in design, comprehensive in function,convenient to operate, high in production efficiency, good in productquality and low in cost.

2. The production line of the invention allows flexible operations, andcan carry out both dyeing and foaming operations, only foaming operationor only dyeing operation on polymer material.

3. According to the production method of the invention, one-step foamingand supercritical fluid dyeing are integrated, so that preheating,foaming and dyeing operations can be completed at different processstages in one device, i.e. the foaming and dyeing kettle, therebysolving the problems that at present, polymer material foaming isgenerally carried out in multiple steps of preheating and foaming, whichleads to system complexity, cumbersome operation, time consumption, highcost, etc., while a dyeing function is not provided.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a block diagram of a foaming and dyeing integrated productionline for a polymeric material product;

FIG. 2 is a schematic view showing the structure of a foaming and dyeingintegrated production line for a polymer material product; and

FIG. 3 is a sectional view of a foaming and dyeing kettle.

DETAILED DESCRIPTION Embodiment 1

Referring to FIG. 1 , the Embodiment 1 of the present invention providesa foaming and dyeing integrated production line for a polymer materialproduct, comprising a foaming and dyeing kettle 1 for foaming and/ordyeing, a pressure control module 2 for controlling operation pressureof the foaming and dyeing kettle 1, a dye separation module 3 forseparating CO₂ from dye remaining after dyeing, a fluid liquefaction andstorage module 4 for liquefying and storing CO₂, a fluid pressurizationdelivery module 5 for pressurizing CO₂, a fluid heating module 6 forheating CO₂, and a dyeing circulation module 7 for circularly deliveringdye in cooperation with CO₂ to the foaming and dyeing kettle 1 fordyeing; the pressure control module 2 is connected to a first fluidoutlet of the foaming and dyeing kettle 1, the dye separation module 3is connected between the pressure control module 2 and the fluidliquefaction and storage module 4, the fluid pressurization deliverymodule 5 is connected between the fluid liquefaction and storage module4 and the fluid heating module 6, the fluid heating module 6 isconnected to both a fluid inlet of the foaming and dyeing kettle 1 andthe dyeing circulation module 7, and the dyeing circulation module 7 isconnected to both the fluid inlet of the foaming and dyeing kettle 1 anda second fluid outlet of the foaming and dyeing kettle 1.

As a further improvement of this embodiment, according to the need, theproduction line may further comprise a discharge module 8 for reducingnoise during pressure release and discharging of a high-pressure fluidafter foaming, and the discharge module 8 is connected to the firstfluid outlet of the foaming and dyeing kettle 1.

As a yet further improvement of this embodiment, according to the need,the production line may further comprise a N₂ supply module 9 forproviding N₂ during foaming operation, and an outlet end of the N₂supply module 9 is connected between the fluid pressurization deliverymodule 5 and the fluid heating module 6.

The Embodiment 1 provides a foaming and dyeing integrated productionmethod for a polymer material product, comprising the following steps:

(1) material loading: a polymer material preform is put into the foamingand dyeing kettle 1, and a dye for dyeing is loaded into the dyeingcirculation module 7;

(2) supercritical fluid dyeing: CO₂ from the fluid liquefaction andstorage module 4 is gasified sequenctially through pressurization in thefluid pressurization delivery module 5 and heating in the fluid heatingmodule 6 and is injected into the foaming and dyeing kettle 1,pressurization is stopped when the CO₂ reaches a supercritical statemeeting requirements of a dyeing process, then the dyeing circulationmodule 7 is started to begin a dyeing circulation process in which theCO₂ in the supercritical state enters the dyeing circulation module 7and dissolves the dye in the dyeing circulation module 7, the CO₂carrying the dye returns to the foaming and dyeing kettle 1 to dye thepolymer material preform in the foaming and dyeing kettle 1 a desiredcolor, when dyeing requirements are met, the CO₂ flows out of thefoaming and dyeing kettle 1 and is subjected to pressure release in thepressure control module 2, the CO₂ is separated from the dye remainingafter dyeing in the dye separation module 3, and the CO₂ with the dyeseparated enters the fluid liquefaction and storage module 4 to beliquefied and stored;

(3) one-step foaming: when the dyeing process is finished, CO₂ and/or N₂pressurized in the fluid pressurization delivery module 5 and heated inthe fluid heating module 6 is injected into the foaming and dyeingkettle 1 according to a proportion of fluid required for foaming, andpressurization is stopped and foaming operation is started whenrequirements of a foaming process are met; and

(4) unloading: when the foaming process is finished, the foaming anddyeing kettle 1 is opened, and a foamed and dyed polymer materialproduct in the foaming and dyeing kettle 1 is taken out.

Among others, the polymer material preform may comprise, but is notlimited to, a sheet, granular or three-dimensional object made of anyone of polyethylene, polylactic acid, polypropylene, polystyrene,polymethyl methacrylate, polycarbonate, acrylonitrile-butadiene-styrenecopolymer, polyethylene terephthalate, polyamide, polyimide,polyphenylene sulfide, polyether sulfone, polyether ether ketone,rubber, silicone rubber, ethylene propylene diene monomer,ethylene-vinyl acetate copolymer, thermoplastic polyurethane,thermoplastic elastomer, or a combination thereof.

The dye may comprise, but is not limited to, any one of a disperse dye,an azoic dye, a cationic dye, a reactive dye, an acid dye, acondensation dye, or a combination of.

Depending on material of the polymer material product, temperatures fordyeing and foaming are individually controlled between 60° C. and 200°C., pressures for dyeing and foaming are individually controlled between10 MPa and 35 MPa, and times for dyeing and foaming are individuallycontrolled between 40 minutes and 180 minutes.

Depending on material of the polymer material product, the fluid fordyeing and foaming may be any one of CO₂, N₂ or a mixture of the twoaccording to a ratio.

Depending on the foaming requirements, the combination of the fluiddescribed above may be repeated for multiple times in a single foamingprocess according to different schemes.

According to the need, polymer material may be subjected to both dyeingand foaming operations, only foaming operation or only dyeing operation.

Embodiment 2

The Embodiment 2 of the invention provides a foaming and dyeingintegrated production line for a polymer material product, which alsocomprises the following as in the Embodiment 1: a foaming and dyeingkettle 1 for foaming and/or dyeing, a pressure control module 2 forcontrolling operation pressure of the foaming and dyeing kettle 1, a dyeseparation module 3 for separating CO₂ from dye remaining after dyeing,a fluid liquefaction and storage module 4 for liquefying and storingCO₂, a fluid pressurization delivery module 5 for pressurizing CO₂, afluid heating module 6 for heating CO₂, and a dyeing circulation module7 for circularly delivering dye in cooperation with CO₂ to the foamingand dyeing kettle 1 for dyeing. On the basis of the Embodiment 1, thevarious parts of the production line in the Embodiment 2 are improved asfollows:

as shown in FIGS. 2 and 3 , the foaming and dyeing kettle 1 is the mainequipment of the production line and is a horizontal autoclave;specifically, the foaming and dyeing kettle 1 may comprise a kettle body11, a lid 12, an agitator driver 115 and an agitator paddle 116, thekettle body 11 is horizontally arranged so as to facilitate loading,cleaning or other operations of materials, the kettle body 11 has ahollow interior, and one end of the kettle body 11 is opened to form anopen end, while the other end of the kettle body 11 is closed to form aclosed end. Moreover, the kettle body 11 is provided with a fluid inlet16 and two fluid outlets 17 each in communication with the interior ofthe kettle body 11, the fluid inlet 16 may be formed in the closed endof the kettle body 11, and the fluid outlets 17 may be formed in the topand/or the bottom of the kettle body 11 and close to the open end of thekettle body 11.

The agitator driver 115 is axially installed at the closed end of thekettle body 11, an agitator shaft of the agitator driver 115 penetratesthrough the kettle body 11 and extends into the kettle body 11, theagitator shaft of the agitator driver 115 is connected to the agitatorpaddle 116 inside the kettle body 11, and the agitator driver 115 iscapable of driving the agitator paddle 116 to rotate. In thisembodiment, the agitator driver 115 may preferably be provided as amagnetic agitator. The agitator driver is capable of driving theagitator paddle to rotate, and the fluid in the kettle body is driven todevelop convective circulation to enhance convective heat transfer andimprove the uniformity of temperature distribution in the kettle body,so that the temperature at every position in the kettle body tends to besame, the consistency of the shape and parameters of the foamed productis guaranteed, and the yield of products is improved.

As the agitator shaft of the agitator driver 115 needs to penetratethrough a hole in the kettle body 11, the space between the agitatordriver 115 and the closed end of the kettle body 11 needs to be sealedwith a first sealing ring 117 to achieve self-energizing sealing.

Preferably, the agitator driver 115 is eccentrically installed relativeto the axis of the kettle body 11. Among others, the eccentricinstallation of the agitator driver relative to the axis of the kettlebody enables the agitator paddle to be more effective in promoting thefluid in the kettle body to develop convective currents.

As shown in FIG. 3 , the lid 12 is installed inside the open end of thekettle body 11 in a sealed manner and is capable of closing the openingof the kettle body 11, wherein an O-shaped second sealing ring 19 isarranged between the lid 12 and the inner wall of the kettle body 11,and the lid 12 may be sealed with the kettle body 11 with the secondsealing ring 19 to achieve high-pressure self-tightening sealing.

As shown in FIG. 3 , a material holder 13 is arranged inside the kettlebody 11, one end of the material holder 13 is fixedly connected to aninner end of the lid 12, and the material holder 13 is configured tohave a frame structure for loading or hanging materials, wherein the lidis connected to the material holder to form an integrated structure suchthat the coming in/out of the material holder and the opening/closing ofthe lid are combined, therefore, the lid only needs to move in onedirection, i.e., the axial direction, and when opened, does not need tomove radially to avoid the material holder which is moving in/out,thereby simplifying the opening of the lid, and saving the space foroperation.

Preferably, the bottom of the material holder 13 may further be providedwith guide wheels 114 to facilitate the moving in/out of the materialholder 13.

As shown in FIG. 3 , an insulation jacket 110 may be arranged outsidethe kettle body 11, an insulation interlayer is formed between theinsulation jacket 110 and the kettle body 11, and an insulation inlet111 and an insulation medium outlet 112 which are in communication withthe insulation interlayer are formed in the insulation jacket 110.Preferably, the insulation medium inlet 111 may be provided at the topof one end of the kettle body 11, the insulation medium outlet 112 maybe provided at the bottom of the other end of the kettle body 11, andthe insulation medium may be hot water, hot oil, etc.

Moreover, a support 113 for supporting the entire foaming autoclave maybe provided outside the insulation jacket 110.

As shown in FIG. 3 , the lid may be locked and unlocked with the kettlebody by means of a wedge-type quick-open locking mechanism, thewedge-type quick-opening locking mechanism may comprise a wedge drivingdevice 15 and a wedge 14, the wedge driving device 15 is installed at anouter end of the lid 12, and the wedge driving device 15 is intransmission connection with the wedge 14. A groove 18 for snap-in fitwith the wedge 14 is formed in the inner wall of the open end of thekettle body 11.

In this embodiment, there may be preferably five wedges 14 and fivewedge driving device 15, each wedge 14 may be configured to be arcshaped and the five wedges 14 may be combined to form an annularstructure; correspondingly, the grooves 18 of the kettle body 11 mayalso be configured to form an annular shape matching with the wedges.The combined wedge structure provides a good locking effect. In actualimplementation, the wedge driving device 15 may preferably be providedas a cylinder.

After the lid is pushed into the open end of the kettle body 11, thewedge driving devices 15 can drive the respective corresponding wedges14 to move radially, so that the wedges 14 can be snapped into thegrooves 18 of the kettle body 11 so as to lock the lid 12. When the lidis to be opened, the wedge driving devices 15 can drive the wedges 14 toleave the grooves 18 of the kettle body 11.

The lid of the foaming autoclave is installed inside the open end (i.e.at an inner diameter position) of the kettle body, and compared with anautoclave having an hoop type opening structure, the lid is not requiredto have the same outer diameter as the kettle body, so that the size ofthe lid is greatly reduced, and the weight is light; besides, in thewedge-type quick-open locking mechanism, the wedge driving devices candrive the respective corresponding wedges to move radially to allow thewedges to be snapped into the grooves in the inner wall of the open endof the kettle body 11 so as to lock the lid, or allow the wedges toleave the grooves of the kettle body to open the lid, so that themechanism is simple and compact in structure and reasonable in design,provides reliable sealing, and simplifies and facilitates the openingand closing of the lid; moreover, the mechanism is mounted along withthe lid in the open end of the kettle bod, so that the installationspace is saved.

As shown in FIG. 2 , the pressure control module 2 may comprise anautomatic pressure regulator valve 21, a first switch valve 22 isarranged between an inlet end of the automatic pressure regulator valve21 and the first fluid outlet of the foaming and dyeing kettle 1, and anoutlet end of the automatic pressure regulator valve 21 is connected tothe dye separation module 3. The automatic pressure regulator valve 21can control the operation pressure of the foaming and dyeing kettleaccording to requirements process.

As shown in FIG. 2 , the dye separation module 3 may comprise anevaporator 31 and a dye recovery and separation kettle 32, an inlet endof the evaporator 31 is connected to the pressure control module 21, anoutlet end of the evaporator 31 is connected to an inlet end of the dyerecovery and separation kettle 32, an outlet end of the dye recovery andseparation kettle 32 is connected to the fluid liquefaction and storagemodule 4, and a second switch valve 33 is arranged at a recovery port ofthe dye recovery and separation kettle 32. Among others, the dyerecovery and separation kettle may be provided as a quick-openhigh-pressure container to recover dye remaining after the dyeingprocess.

As shown in FIG. 2 , the fluid liquefaction and storage module 4 maycomprise a condenser 41, a CO₂ circulating storage tank 42, a CO₂replenishing storage tank 43 and a CO₂ delivery pump 44, an inlet end ofthe condenser 41 is connected to the dye recovery and separation kettle32, an outlet end of the condenser 41 is connected to an inlet end ofthe CO₂ circulating storage tank 42, an outlet end of the CO₂circulating storage tank 42 is connected to the fluid pressurizationdelivery module 5, the CO₂ delivery pump 44 is connected between anoutlet end of the CO₂ replenishing storage tank 43 and a fluidreplenishing port of the CO₂ circulating storage tank 42, and a thirdswitch valve 45 is arranged between the CO₂ delivery pump 44 and the CO₂replenishing storage tank 43.

Among others, the condenser 41 may be provided as a tube-sheet heatexchanger, which functions to cool and liquefy CO₂ gas separated by thedye separation and recovery kettle into a liquid state for storage inthe CO₂ circulating storage tank. The CO₂ replenishing storage tankstores liquid CO₂ to replenish the CO₂ circulating storage tank. Withthe operation of the production line, the CO₂ may be consumed, and whenthe amount of liquid CO₂ stored in the CO₂ circulating storage tank isbelow a specified value, it needs the CO₂ replenishing storage tank toreplenish the CO₂ circulating storage tank.

As shown in FIG. 2 , the fluid pressurization delivery module 5 maycomprise a CO₂ high-pressure pump 51, an inlet end of the CO₂high-pressure pump 51 is connected to an outlet end of the CO₂circulating storage tank 42, and an outlet end of the CO₂ high-pressurepump 51 is connected to the fluid heating module 6.

As shown in FIG. 2 , the fluid heating module 6 may comprise a heater61, an inlet end of the heater 61 is connected to an outlet end of theCO₂ high-pressure pump 51, a fourth switch valve 62 is arranged at anoutlet end of the heater 61, and an outlet end of the fourth switchvalve 62 is connected to both a fluid inlet of the foaming and dyeingkettle 1 and the dyeing circulation module 7. The heater 61 is capableof heating CO₂ and N₂ fluids.

As shown in FIG. 2 , the dyeing circulation module 7 may comprise adyeing circulation pump 71 and a dye kettle 72 a fifth switch valve 73is arranged between an outlet end of the dyeing circulation pump 71 anda fluid inlet of the foaming and dyeing kettle 1, an outlet end of thedye kettle 72 is connected to an inlet end of the dyeing circulationpump 71, and a sixth switch valve 74 is arranged between an inlet end ofthe dye kettle 72 and the second fluid outlet of the foaming and dyeingkettle 1. The dye kettle 72 stores therein dye for dyeing operation.

As shown in FIG. 2 , the discharge module 8 may comprise a silencer 81and an eighth switch valve 82, and the eighth switch valve 82 isconnected between the silencer 81 and the first fluid outlet of thefoaming and dyeing kettle 1.

As shown in FIG. 2 , the N₂ supply module 9 may comprise a N₂ storagetank 91, a N₂ high-pressure pump 92 and a vaporizer 93, a seventh switchvalve 94 is arranged between an outlet end of the N₂ storage tank 91 andan inlet end of the N₂ high-pressure pump 92, an inlet end of thevaporizer 93 is connected to an outlet end of the N₂ high-pressure pump92, and an outlet end of the vaporizer 93 is connected between the CO₂high-pressure pump 51 and the heater 61. The N₂ storage tank 91 storesliquid N₂ for foaming operation.

The Embodiment 2 provides a foaming and dyeing integrated productionmethod for a polymer material product, comprising the following steps:

(1) material loading: a polymer material preform is put into the foamingand dyeing kettle 1, and a dye for dyeing is loaded into the dye kettle72;

(2) supercritical fluid dyeing: after material loading is finished, thefirst switch valve 22, the sixth switch valve 74 and the eighth switchvalve 82 are closed, the fourth switch valve 62 is opened, the CO₂high-pressure pump 51 is started, liquid CO₂ in the CO₂ circulatingstorage tank 42 is gasified sequentially through pressurization in theCO₂ high-pressure pump 51 and heating in the heater 61 and is injectedinto the foaming and dyeing kettle 1, the pressure in the foaming anddyeing kettle 1 is gradually increased, and pressurization is stoppedwhen the CO₂ reaches a supercritical state meeting requirements of adyeing process (i.e. the pressure and temperature reach preset values);the fourth switch valve 62 is closed and the fifth switch valve 73 andthe sixth switch valve 74 are opened such that the foaming and dyeingkettle 1 is in communication with the dye kettle 72 and the dyeingcirculation pump 71 to begin a dyeing circulation process in which theCO₂ in the supercritical state enters the dyeing circulation module 7and dissolves the dye in the dyeing circulation module 7, the CO₂carrying the dye returns to the foaming and dyeing kettle 1 to dye thepolymer material preform in the foaming and dyeing kettle 1 a desiredcolor; when dyeing requirements are met, the fifth switch valve 73 andthe sixth switch valve 74 are closed, the first switch valve 22 isopened, the CO₂ flows out of the foaming and dyeing kettle 1 and issubjected to pressure release via the automatic pressure regulator valve21 and then heated in the evaporator 31 and enters the dye recovery andseparation kettle 32, the CO₂ is separated from the dye remaining afterdyeing and the dye is recovered via the second switch valve 33, the CO₂with the dye separated enters the condenser 41 to be cooled andliquefied, the liquefied CO₂ enters the CO₂ circulating storage tank 42to be stored for subsequent use;

(3) one-step foaming: when the dyeing process is finished, the firstswitch valve 22 and the eighth switch valve 82 are closed, CO₂ and N₂are pressurized and injected according to a proportion of fluid requiredby foaming, in which the CO₂ comes from CO₂ in the CO₂ circulatingstorage tank 42 which is pressurized and injected via the CO₂high-pressure pump 51, and the N₂ comes from liquid N₂ in the N₂ storagetank 91 which is pressurized and output via the N₂ high-pressure pump 92and is injected after being gasified by the vaporizer 93; the CO₂ and N₂are heated via the heater to meet the requirements of the foamingprocess, pressurization is stopped when the fluid pressure also meetsthe requirements, and the foaming operation is started; in the foamingprocess, the agitator driver 115 of the foaming and dyeing kettle 1 isstarted to enhance the convection of fluid in the kettle and make thetemperature in the kettle uniform, and according to the requirements ofdifferent materials, the foaming process may be carried out using CO₂and N₂ in multiple combinations alternatively in the foaming operation;and after the foaming operation is finished, the eighth switch valve 82is opened, and the high-pressure fluid is released and dischargedthrough the silencer 81.

(4) unloading: when the foaming process is finished, the foaming anddyeing kettle 1 is opened, and a foamed and dyed polymer materialproduct in the foaming and dyeing kettle 1 is taken out.

The above-described embodiments are preferred embodiments of the presentinvention, but the embodiments of the present invention are not limitedto the above-described embodiments, and any other changes,modifications, substitutions, combinations, simplifications, which donot depart from the spirit and principles of the present invention areintended to be equivalent and fall within the scope of the presentinvention.

The invention claimed is:
 1. A foaming and dyeing integrated productionline for a polymer material product, comprising a foaming and dyeingkettle for foaming and/or dyeing, a pressure control module forcontrolling operation pressure of the foaming and dyeing kettle, a dyeseparation module for separating CO₂ from dye remaining after dyeing, afluid liquefaction and storage module for liquefying and storing CO₂, afluid pressurization delivery module for pressurizing CO₂, a fluidheating module for heating CO₂, and a dyeing circulation module forcircularly delivering dye in cooperation with CO₂ to the foaming anddyeing kettle for dyeing; the pressure control module is connected to afirst fluid outlet of the foaming and dyeing kettle, the dye separationmodule is connected between the pressure control module and the fluidliquefaction and storage module, the fluid pressurization deliverymodule is connected between the fluid liquefaction and storage moduleand the fluid heating module, the fluid heating module is connected toboth a fluid inlet of the foaming and dyeing kettle and the dyeingcirculation module, and the dyeing circulation module is connected toboth the fluid inlet of the foaming and dyeing kettle and a second fluidoutlet of the foaming and dyeing kettle.
 2. The foaming and dyeingintegrated production line for the polymer material product of claim 1,wherein the foaming and dyeing kettle comprises a kettle body, a lid, anagitator driver and an agitator paddle, the kettle body is horizontallyarranged, the lid is installed inside an open end of the kettle body ina sealed manner, the agitator driver is axially installed at a closedend of the kettle body, an agitator shaft of the agitator driverpenetrates through the kettle body and extends into the kettle body, theagitator shaft is connected to the agitator paddle inside the kettlebody, and the lid is locked and unlocked with the kettle body by meansof a wedge-type quick-open locking mechanism.
 3. The foaming and dyeingintegrated production line for the polymer material product of claim 1,wherein the pressure control module comprises an automatic pressureregulator valve, a first switch valve is arranged between an inlet endof the automatic pressure regulator valve and the first fluid outlet ofthe foaming and dyeing kettle, and an outlet end of the automaticpressure regulator valve is connected to the dye separation module. 4.The foaming and dyeing integrated production line for the polymermaterial product of claim 1, wherein the dye separation module comprisesan evaporator and a dye recovery and separation kettle, an inlet end ofthe evaporator is connected to the pressure control module, an outletend of the evaporator is connected to an inlet end of the dye recoveryand separation kettle, an outlet end of the dye recovery and separationkettle is connected to the fluid liquefaction and storage module, and asecond switch valve is arranged at a recovery port of the dye recoveryand separation kettle.
 5. The foaming and dyeing integrated productionline for the polymer material product of claim 1, wherein the productionline further comprises a discharge module for reducing noise duringpressure release and discharging a pressurized fluid after foaming, thedischarge module is connected to the first fluid outlet of the foamingand dyeing kettle, the discharge module comprises a silencer and aneighth switch valve, and the eighth switch valve is connected betweenthe silencer and the first fluid outlet of the foaming and dyeingkettle.
 6. The foaming and dyeing integrated production line for thepolymer material product of claim 1, wherein the fluid liquefaction andstorage module comprises a condenser, a CO₂ circulating storage tank, aCO₂ replenishing storage tank and a CO₂ delivery pump, an inlet end ofthe condenser is connected to the dye separation module, an outlet endof the condenser is connected to an inlet end of the CO₂ circulatingstorage tank, an outlet end of the CO₂ circulating storage tank isconnected to the fluid pressurization delivery module; the CO₂ deliverypump is connected between an outlet end of the CO₂ replenishing storagetank and a fluid replenishing port of the CO₂ circulating storage tank,and a third switch valve is arranged between the CO₂ delivery pump andthe CO₂ replenishing storage tank.
 7. The foaming and dyeing integratedproduction line for the polymer material product of claim 1, wherein thefluid pressurization delivery module comprises a CO₂ pressurized pump,an inlet end of the CO₂ pressurized pump is connected to an outlet endof the fluid liquefaction and storage module, and an outlet end of theCO₂ pressurized pump is connected to the fluid heating module.
 8. Thefoaming and dyeing integrated production line for the polymer materialproduct of claim 1, wherein the fluid heating module comprises a heater,a fourth switch valve is arranged at an outlet end of the heater, and anoutlet end of the fourth switch valve is connected to both the fluidinlet of the foaming and dyeing kettle and the dyeing circulationmodule.
 9. The foaming and dyeing integrated production line for thepolymer material product of claim 1, wherein the dyeing circulationmodule comprises a dyeing circulation pump and a dye kettle, a fifthswitch valve is arranged between an outlet end of the dyeing circulationpump and a fluid inlet of the foaming and dyeing kettle, an outlet endof the dye kettle is connected to an inlet end of the dyeing circulationpump, and a sixth switch valve is arranged between an inlet end of thedye kettle and the second fluid outlet of the foaming and dyeing kettle.10. The foaming and dyeing integrated production line for the polymermaterial product of claim 1, wherein the production line furthercomprises a N₂ supply module for providing N₂ during foaming operation,an outlet end of the N₂ supply module is connected between the fluidpressurization delivery module and the fluid heating module, the N₂supply module comprises a N₂ storage tank, a N₂ pressurized pump and avaporizer, a seventh switch valve is arranged between an outlet end ofthe N₂ storage tank and an inlet end of the N₂ pressurized pump, aninlet end of the vaporizer is connected to an outlet end of the N₂pressurized pump, and an outlet end of the vaporizer is connectedbetween the fluid pressurization delivery module and the fluid heatingmodule.